Pearson 1985 64 nov. 18 Barideebe, Warm, nov. 19 Warm in morning. Left 4 p.m to set traps for Ctenomys socialis along the road 10 km NNE Nahuel Huapi (the outlet of Lago Nahuel Huapi). Showers thunder + lightning. Saw no fresh tracks digging and heard no singing, lots of Rattler droppings. Put 15 steel + cage traps on the west side of the highway, and about 12 more between the double fence on the east side of the road where there were lots of Rattler droppings in fairly distinct tramways between burlegras, mesas, Seneia, one Cottaba. By sunset, 2 also longi in steel traps (8:45 p.m. at 10:40 p.m. (half moon, cloudy) 2 more also longi, 1 achilisomp, and 1 Rattledar alive and 2 dead. nov. 20 10 km NNE Nahuel Huapi. Morning Cloudy / foggy. Traps west of road held 1 also pantla, 3 also longi, 1 Ctenomys socialis, 2 Oryzomys, and 1 Rattler. Traps east of road held 1 also longi and 1 Andicomp. Total for the 28 traps was : 3 andicos, 1 Ctenomys, 1 also pantla, 7 also longi, 2 Oryzomys, and 4 Rattledar = £ 18. about an hour with the night vision goggles I saw nothing (except low-flying moths). Running the truffle line with flashlight saw nothing. The only evidence of the tucas was a few old barroco plugged deep inside with cut grass stone. The Ctenomys socialis was a lactating female.